code: def y(self):
      return pd.Series([2, 8, 3, 5, 9], name="y")
  
imports: import numpy
  import pandas
  from matplotlib.colors import to_rgba, to_rgba_array
  import pytest
  from numpy.testing import assert_array_equal
  from seaborn._core.plot import Plot
  from seaborn._marks.bar import Bar, Bars
label_desc: Use image node_id 2 for calling the TestBars obj's underlying member method code with example usage: obj.y() and returns: pd